What I don't get is that Steam sells VNs that have patches to reintroduce the content that would give it an AO rating, you can mention such patches exists in a steam review. When Sekai project (the publisher) asked Valve if they were cool with it, they said it was fine. So why can't they just allow AO games to be sold on the storefront? There are some pretty easy ways to make sure kids can't get them.
People are weird. (Just look at what Jeff went through from people on both sides of the argument)